Can I change the type of margin on coins remotely in the MoonBot futures terminal?

Yes, this can be done using the telegram command “Margin [coin,coin | ALL] ISO\Cross”.
Examples:
Margin BTC Cross – set margin on BTC coin
Margin BTC,ETH ISO – set isolated margin on BTC and ETH coins
Margin ALL Cross – set a cross margin on ALL coins
Margin ALL ISO – set isolated margin on ALL coins